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The feature to subscribe others was introduced Tableau 10 (server). For the second part of your question - check this thread: Can you Subscribe a Distribution list to a Report Schedule?
Atleast, can an admin subscribe other users in Tableau9.3 through some admin/tabcmd settings?
Based on the help file article for v9.3 - https://onlinehelp.tableau.com/v9.3/server/en-us/help.htm#subscribe.htm it does not seem like an admin can create a subscription on behalf of someone else. It has been a while since I worked with 9.3 so cant exactly validate.
However, you could consider this mechanism as an alternative? https://www.interworks.com/blog/tladd/2013/08/22/automated-pdf-email-distribution-tableau-views-using-powershell-and-tabcmd.